“…This finding does not only hold true for illegal drug use but also for alcohol use. Countless studies have shown higher lifetime prevalence (once in a lifetime use), higher prevalence of weekly or daily alcohol use, and higher quantities or doses per user among SW (Folch et al, 2008;Gossop et al, 1995;Inciardi, Surratt, Kurtz, & Weaver, 2005;Li, Li, & Stanton, 2010;Plant, Plant, & Thomas, 1990;Potterat, Rothenberg, Muth, Darrow, & Phillips-Plummer, 1998). Moreover, it is known that drug using SW often use more than one product (Brecht, Huang, Evans, & Hser, 2008;Falcón, 2007;Lorvick, Martinez, Gee, & Kral, 2006;Surratt, Inciardi, & Kurtz, 2006).…”